I think Leavanny deserves to be pushed up a bit (A-). I completed the game up till the end point with Leavanny and its still my fastest member on my team (besides Noivern). Super fast Will-o-Wisp CRIPPLES opponents easily. It also helps against threats like Angie's Walrein and Mamoswine (speed + willowisp/leaf blade), Narcissa's Dusclops (Willowisp to whittle it down), Crawli (outspeeds), Marianette (Slaking willowisp), and Valerie (obvious). X Scissor, Leaf Blade, Will O Wisp, and Protect seems to be the best set for it.